#include <stdio.h>

void critic(void);

int units = 0;

int main(void)
{
    extern int units;

    printf("How many prounds to a firken of butter?\n");
    scanf("%d", &units);
    while (units != 56)
        critic();
    printf("You must have looked it up!\n");

    return 0;
}

void critic(void)
{
    printf("No luck, my friend. Try again.\n");
    scanf("%d", &units);
}